I start 10 percent under max, touching the lands, with IMR 4350 when suitable. Its my number one used powder and always in stock. My 22-250 was a ragged hole on the first charge tried due to sheer dumb luck. It has been altered since but still great. It too is a Shaw 26" Varmint and has shot a few sub 1/4" center to center 5 shot groups at 100yrd. Obviously not every time, but its sub 3/4" evertime and sub 1/2" 90% of the time, conditions dependent. Mine cleans soooooo easy too I couldn't be happier for the money.
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